Flux CP using Fluxbb problem

[Thanna]

I tried to install Fluxbb on my FluxCP I follow sir jupeto's instruction carefully and I installed on my fluxcp using the fluxbb installation wizard but when I click on Fluxbb on the menu it shows this error, can someone help me on my problem thanks in advance

 

 

this is the error that shows up when I go on my fluxBB

 

 

Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\flux3\themes\default\header.php:7) in C:\xampp\htdocs\flux3\addons\fluxbb\themes\default\fluxbb\index.php on line 7

Notice: Undefined variable: pun_user in C:\xampp\htdocs\flux3\addons\fluxbb\themes\default\fluxbb\index.php on line 10

Notice: Undefined variable: pun_user in C:\xampp\htdocs\flux3\addons\fluxbb\themes\default\fluxbb\index.php on line 15

Warning: require(fluxbb/lang//index.php) [function.require]: failed to open stream: No such file or directory in C:\xampp\htdocs\flux3\addons\fluxbb\themes\default\fluxbb\index.php on line 15

Fatal error: require() [function.require]: Failed opening required 'fluxbb/lang//index.php' (include_path='lib;.;C:\xampp\php\PEAR') in C:\xampp\htdocs\flux3\addons\fluxbb\themes\default\fluxbb\index.php on line 15

Edited September 5, 2013 by Thanna